dns_update_log shows dynamic entries deleted

Posted by Cuttler, Brian (HEALTH) on Jun 09, 2015; 3:45pm
URL: http://isc-dhcp-users.193.s1.nabble.com/dns-update-log-shows-dynamic-entries-deleted-tp194.html

We are running on Centos 7.1 and have dhcp 4.2.5, with bind 9.9.4.

 

We are running dhcp with subnet 10.57.36.0/22 permitted dynamic dns udpates, except for the last 100 addresses in the pool, which we excluded to allow for static addresses that we needed.

 

Things have been working wonderfully – but at 08:18 this morning a large number of entries were removed from dynamic dns.

 

The dhcp clients were either, only asleep for the night (Windows, printers) or actually online (linux).

 

I’ve no idea why these DNS entries were removed, exactly how to get them back, and how to prevent them from being removed again.

 

I’d suspect it was a lease expiration issue, but these machines all check in and renew, at least they should be, I can check the boot.log and see.

 

Thanks for your help,

Brian

 

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